Pipe-threading machine.



44 o 31 43 A 45- 42 g A LP-2W9 a WITNESSES; INVEINTOR Z.B. Cur-i119,

COLUMBIA PLANOGRAPH c0.,WAsHlNGTON. n. c.

Patented Sept. 9, 1913.

BEETS-Sunni.

L. B. CURTIS.

PIPE THRBADING MACHINE.

APILIOATIOIIv FILED MAY 29, 1912.

1,072,830, Patented Sept. 9, 1913.

2 SHEETSSHEET.2.

INVENTOR- ,LiiC'ufllS ATTORNEY COLUMBIA PLANOuRAPH C0,,WASHXNGTON. D. c.

. LEWIS B. CURTIS, 0F BRIDGEPORT, CONNECTICUT.

lPIPE-THREADING- MAGHIN E.

Specification of Letters Patent.

Patented Sept. 9, 1913.

Application filed May 29, 1912. Serial No. 700,384.

To all whom it may concern.

Be it known that I, LEWIS B, CURTIS, a citizen of the United States, residing in the city of Bridgeport, county of-Fairfield, State of Connecticut, have invented certain; new and useful Improvements in Pipe Threading Machines; and I do declare the following to be a full, clear, and exact de scription of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to certain improvements in pipe threading machines, but more particularly has reference to that class of such machines in which a circumferentially toothed die carrying ring is journaled within a casing, andis actuated by means of an elongated pinion which meshes with. the teeth on the ring, the latter having a free slidingmovement so that the dies will ad- Vance along the pipe during the threading operation. V

The objects of my invention are to greatly simplify the manner in which the cam ring is properly confined and held in its adjustments, to provide means whereby, in cutting threads on some sizes of pipe, it is not necessary to. constantly adjust the cam ring to a gage, and to so construct and dispose the chip shedder that it is im-v possible for any chips to 'clog any of the working parts of the machine, and with these ends in view my invention consists in the details of construction and combination of parts hereinafter fully described and then particularly pointed out in the claims which conclude this description.

In the accompanying drawing Figure 1 is a front elevation of my lmproved machineF1g. 2 a section at the line w, w, of

Fig. lFig. 3 a detail elevation of the inner face of the cam ring, and Fig. 4 a detail elevation of one of the dies;

Similar numerals of reference denote like parts in the several figures of the drawings.

1 is the casing which is provided with feet 2 that rest upon a tray 3 which forms the roof of a hollow box-like standard 4:. WVithin this casing is circumferentially journaled the die carrying ring 5 having gear teeth 6 on its periphery said ringbeing free to revolve within the casing and to likewise have a movement lengthwise of its axis. Suitably journaled within this casing is an elongated pinion 7 which serted through the inner wall of the ring 5, said meshes with the teeth on the ring 5 whereby motion is imparted to the latter.

8 are the dies which are primarily inwithin suitable recesses '9 out dies having free movement longitudinally within these recesses and provided with outwardly extending pins 10 at their rear ends which pins extend within cam grooves 11 formed in the cam plate 12. This cam plate 12 is annular in form and fits within a suitable annular recess in the outer face of the ring 5 and is located immediately outside the dies.

13 is the chip shedder ring which is bolted directly to the die carrying ring, preferably by means of screws 14, and this ring 13 has a shouldered portion 15 which overlaps the plate 12 and serves to confine the latter in its proper position without exerting a binding force sufficient to pre vent the free rotation of said plate 12. The rear wall of this ring 13 is snug against the dies 8 so that the latter can have no movement except a longitudinal movement such as is necessary to adjust the dies inwardly or outwardly according to the size of pipe to be threaded.

Right here I think it proper to call at tention, to the fact that the outer or shed ding portion of this ring 13' is unbroken so that it presents a perfectly smooth surface whereby the chips will be discharged without the slightest possibility of their getting into the working parts of the machine, and this-is a result never before accomplished in machines of this particular description, because heretofore the shedder and die carrying ring have been integral, and it has been found necessary to recess both the shedder and ring for the insertion of the dies, and the notched portions of the shedder prevent the perfect shedding of the chips.

Extending from the outer face of the plate 12 are pins 16 which are engaged by' any suitable hand too-l for the purpose of rotating the plate in the adjustment of the dies through the medium of the pins 10 that travel in the cam grooves 11, this manner of adjusting the dies inwardly and outwardly being old and well known and requiring no further description.

On the shedder ring 13 is a gage line which is marked 0 and on the outer edge of the plate 12 are gage lines which are marked to indicate the size of pipe to be' When a machine is running for anylength of time for the purpose of cutting threads on many sections of pipe of the.

samediameter, the dies are constantly operated to withdraw them from a threaded pipe and when a succeeding pipe is placed in position it again becomes necessary to set these dies by the gages and thiscaus'es loss of time besides being quite a nuisance, and I [have therefore contrived means whereby, after a gage has once been determined, it becomes no longer necessary to again find these gages in threading similar pipe.

17 is a suitably shaped elongated stop provided with an elongated arcuate slot 18, through which slot extends a pin 19 which pin is rigid with the die carrying ring, the outer end of this pin being threaded and engaged by a wing nut 20 which latter binds the stop 7 firmly against the outer face of the plate 12 against which said stop is assembled. 21 is a shoulder that extends rigidly from the ring 13 in the path of said stop. p v After the cam plate is suitably adjusted by means of the gage heretofore described, for threading a certain size of pipe, the wing nut 20 is loosened and the stop 17 is then forced into contact with the shoulder 21, and the wing nut is then tightened so as to firmly bind this stop in this position,

and thereafter, in threading similar pipes,

it is merely necessary to revolve the cam plate 12 until this stop 17 abuts against the shoulder 21, without paying any attention whatsoever to the gage marks.

Of course machines of this description are made in various sizes according to the general size of .pipe to be threaded, some machines threading pipe having a diameter as great as 6 inches, others threading pipe a little larger, and finally others which are capable of threading pipe 18 inches or more in diameter, and therefore the gage marks will be diiferent on different sizes of machines, and in some machines it will be necessary to make the stop 17 longer than in others according to thethro w of the plate 12 necessary to bring about the proper adjustmen't of the dies in threading from a minimum to a maximum size of pipe, but these matters are mere factory expedients and do not enter into the essence of my invention. A 4 V Pivoted to the outer sidewall of the ring 13 is a cam 22 providedwith a handle 23, and by throwing this cam in one direction it will bind firmly against the ring 12 and hold the latter securely in its adjusted p0- sition, the opposite throw of said cam serving to release said ring so that it may be operated to adjust the dies, and this feature, although exceedingly simple, nevertheless is very valuable in machines of this description, because hitherto it has been necessary tosecure the cam plate 12 ata pl'u- V rality of locations and by devices independently operated. In the present instance the shedder ring 13 holds the cam plate snugly throughout its entire area so that it cannot 1 )o'ssibly tilt, and therefore asingl'e device like the cam 22 has function except to prevent the rotation of this plate 12 and is therefore amplysuffic'ient for the purpose. Within the hollow standard s an ordinaryelec tric motor denoted by the numeral 24 on whose shaft is a spur gear25 (shown in dotted lines) which meshes with a larg gear 26 whose share is suitably journaled within, said standard and carries a'spur' gear 27 mesh wi large gear 28 whoseshaft is likewise ournaled within thestandard and carries a spur gear (shown dotted lines) that is in mesh with a comparatively large gear 30 that is rigid 'on a shaft 31 ,journaled in suitable bearings supported by- Ssh'own in dotted time) that is in ti said standard. Loose on this shaft 31 is a gear wheel 32 provided with a notcl'red hub 33 and meshing with a comparatively smaller gear 34: that is rigid on the shaft 35 that carries the elongated pinion 7 Also, loose 'on the shaft 31 is a gear wheel having a notched hub 37 and meshing with is rigid on the shaft 35-.

Splined on theshaft '31 is a grooved collar 39 whose side's are no'tched to correspond with the notched hubs 33 and 37, and 401s V a lever that is pivoted to the tray 3 in any ios ordinary manner and is provided with suit.

able pins that engage the groove in the collar 39 so that bysw'inging this lever in one direction said collar will be locked with the gear 32 to impart a comparatively fast Speed the pinion 7 and cons' q fi tly t0 the ring 5', while the swinging of the lever &O in the opposite direction will cause said collar to be locked'with the gear 36 thereby giving the pinion 7 and the ring 5 a slower speed. This 'differential gearing and the manner of bringin" the same into operation as above describec is old and well known-.-

forms no part of my present invention,

and I have described the same briefly because it is the first time that such gearing has been operatively installed on a machine of this description in which the'die carryiirg ring is oircumferentially journale'd without any axial sha'ft whatsoever. Also, I have equipped my improved machine with means for afl ordingaconstant lubrication of the threading toolsdiiri ng the thread cutting operations, which I will now briefly ioo a comparatively larger gear wheel 38 that I describe, and in this connection I would say that the smooth unbroken surface of the chip shedder renders the use of a lubricant exceedingly advantageous because there are no unbroken or rough places to interrupt the free discharge of the oil, when once used, into the tray 3. Leading into the bottom of this tray 3 is a pipe 41, and to this pipe is connected a suitable cylinder 42 in whose ends are valves (not shown) that open in the same directions, and to this cylinder is connected an ordinary pump 43 having a piston 44 and a piston rod 45 the extremities of which latter are pivoted respectively to the piston itself and to the shaft 31 eccentric thereof, so that it will be readily understood that the revolution of such shaft will eiiect the proper movements of the piston.

The pipe 41 is continued by means of suitable jointed portions and is provided with a discharge nozzle 46 that may be, suitably directed so that when the machine operates the lubricant will continually be dischargedagainst the dies, and such lubricant will drip downwardly into the tray 3 so that it can be again used. 7 i I My improved machine is provided with the usual means for cuttingioif pipe and for initially forcing the die carrying ring inwardly so as to bring the tools against the pipe; also, I employ the usual spindle 47 mounted Within the casing 1. and provided with a hand wheel 48 and carrying the vise jaws 49, for holding the pipe during the threading or cutting off operations, but these several devices are old and well known and form no part of my present invention. r

Having thus described my invention what I claim as new and desire to secure by Letters Patent is 1. In a pipe threading machine, a die holder, a support within which said holder is movable rotatably and axially, means for providing such movements, a cam ring ex tending within the planes of the holder, and an annular chip shedder secured to the holder and movable therewith, said shedder having an annular shoulder adapted to overhang and retain said cam ring in position.

2. In a pipe threading machine, a die holder, a support within which said holder is movable rotatably and axially, means for providing such movements, a cam ring extending within the planes of the holder, and an annular chip shedder having an annular shoulder adapted to overhang and retainsaid cam ring in position, said shedder having an axial length to project from said support throughout the movements of the holder.

3. In a pipe threading machine, a die holder, a support within which said holder is movable rotatably and axially, means for providing such movements, a cam ring extending within the planes of the holder, and an annular chip shedder secured to the holder and movable therewith, said shedder having an annular shoulder adapted to overhang and retain said cam ring in position, said holder having an annular flange forming a wall encircling the peri hery of the cam ring.

7 4. In a pipe threading machine, a die holder, a support within which said holder is movable rotatably and axially, means for providing such movements, a cam ring extending within the planes of the holder, and an annular chip shedder secured to the holder and movable therewith, said shedder having an annular shoulder adapted to overhang and retain said cam ring in position, the. shedder annulus having a cam member pivoted to its periphery and adapted to cooperate with the exposed portion of the cam ring face to clamp the ring in adj usted position.

1 5. In a pipe threading machine, a die holder, a support within which said holder is movable rotatably and axially, means for providing such movements, a cam ring extending within the planes of the holder, and an annular chip shedder secured to the holder and movable therewith, said shedder having an annular shoulder adapted to overhang and retain said cam ringin position, the shedder annulus having a cam member pivoted to its periphery and adapted to cooperate with the exposed portion of the cam ring face to clamp the ring in ad justed position, said cam member having its pivot extending in a direction transverse to the axis of the cam ring.

In testimony whereof I aifix my signature in presence of two witnesses.

LEWIS B. CURTIS.

Witnesses F. W. SMITH, Jr., M. T. LONGDEN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of latents. Washington, D. O. 

